package com.qnw.CardGroupManagement;

import android.annotation.SuppressLint; 
import android.content.Context; 
import android.content.res.TypedArray; 
import android.graphics.Canvas; 
import android.graphics.Movie; 
import android.os.Build; 
import android.util.AttributeSet; 
import android.view.View;
import com.ygo.feihua.R; 
public class GifView extends View
{ 
	/** 
	 * 默认为1秒 
	 */ 
	private static final int DEFAULT_MOVIE_DURATION = 1000; 
	private int mMovieResourceId; 
	private Movie mMovie; 
	private long mMovieStart; 
	private int mCurrentAnimationTime = 0; 
	private float mLeft; 
	private float mTop; 
	private float mScale; 
	private int mMeasuredMovieWidth; 
	private int mMeasuredMovieHeight; 
	private boolean mVisible = true; 
	private volatile boolean mPaused = false; 
	public GifView(Context context)
	{ 
		this(context, null); 
	} 
	public GifView(Context context, AttributeSet attrs)
	{ 
		this(context, attrs, R.styleable.CustomTheme_gifViewStyle); 
	} 
	public GifView(Context context, AttributeSet attrs, int defStyle)
	{ 
		super(context, attrs, defStyle); 
		setViewAttributes(context, attrs, defStyle); 
	} 
	@SuppressLint("NewApi") 
	private void setViewAttributes(Context context, AttributeSet attrs, 
								   int defStyle)
	{ 
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
		{ 
			setLayerType(View.LAYER_TYPE_SOFTWARE, null); 
		} 
		// 从描述文件中读出gif的值，创建出Movie实例 
		final TypedArray array = context.obtainStyledAttributes(attrs,R.styleable.GifView, defStyle, R.style.AppTheme); 
		mMovieResourceId = array.getResourceId(R.styleable.GifView_gif, -1); 
		mPaused = array.getBoolean(R.styleable.GifView_paused, false); 
		array.recycle(); 
		if (mMovieResourceId != -1)
		{ 
			mMovie = Movie.decodeStream(getResources().openRawResource( 
											mMovieResourceId)); 
		} 
	} 
	/** 
	 * 设置gif图资源 
	 * 
	 * @param movieResId 
	 */ 
	public void setMovieResource(int movieResId)
	{ 
		this.mMovieResourceId = movieResId; 
		mMovie = Movie.decodeStream(getResources().openRawResource( 
										mMovieResourceId)); 
		requestLayout(); 
	} 
	public void setMovie(Movie movie)
	{ 
		this.mMovie = movie; 
		requestLayout(); 
	} 
	public Movie getMovie()
	{ 
		return mMovie; 
	} 
	public void setMovieTime(int time)
	{ 
		mCurrentAnimationTime = time; 
		invalidate(); 
	} 
	/** 
	 * 设置暂停 
	 * 
	 * @param paused 
	 */ 
	public void setPaused(boolean paused)
	{ 
		this.mPaused = paused; 
		if (!paused)
		{ 
			mMovieStart = android.os.SystemClock.uptimeMillis() 
				- mCurrentAnimationTime; 
		} 
		invalidate(); 
	} 
	/** 
	 * 判断gif图是否停止了 
	 * 
	 * @return 
	 */ 
	public boolean isPaused()
	{ 
		return this.mPaused; 
	} 
	@Override 
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
	{ 
		if (mMovie != null)
		{ 
			int movieWidth = mMovie.width(); 
			int movieHeight = mMovie.height(); 
			int maximumWidth = MeasureSpec.getSize(widthMeasureSpec); 
			float scaleW = (float) movieWidth / (float) maximumWidth; 
			mScale = 1f / scaleW; 
			mMeasuredMovieWidth = maximumWidth; 
			mMeasuredMovieHeight = (int) (movieHeight * mScale); 
			setMeasuredDimension(mMeasuredMovieWidth, mMeasuredMovieHeight); 
		}
		else
		{ 
			setMeasuredDimension(getSuggestedMinimumWidth(), 
								 getSuggestedMinimumHeight()); 
		} 
	} 
	@Override 
	protected void onLayout(boolean changed, int l, int t, int r, int b)
	{ 
		super.onLayout(changed, l, t, r, b); 
		mLeft = (getWidth() - mMeasuredMovieWidth) / 2f; 
		mTop = (getHeight() - mMeasuredMovieHeight) / 2f; 
		mVisible = getVisibility() == View.VISIBLE; 
	} 
	@Override 
	protected void onDraw(Canvas canvas)
	{ 
		if (mMovie != null)
		{ 
			if (!mPaused)
			{ 
				updateAnimationTime(); 
				drawMovieFrame(canvas); 
				invalidateView(); 
			}
			else
			{ 
				drawMovieFrame(canvas); 
			} 
		} 
	} 
  @SuppressLint("NewApi") 
  private void invalidateView() { 
	  if (mVisible) { 
		  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { 
			  postInvalidateOnAnimation(); 
		  } else { 
			  invalidate(); 
		  } 
	  } 
  } 
  private void updateAnimationTime() { 
	  long now = android.os.SystemClock.uptimeMillis(); 
	  // 如果第一帧，记录起始时间 
	  if (mMovieStart == 0) { 
		  mMovieStart = now; 
	  } 
	  // 取出动画的时长 
	  int dur = mMovie.duration(); 
	  if (dur == 0) { 
		  dur = DEFAULT_MOVIE_DURATION; 
	  } 
	  // 算出需要显示第几帧 
	  mCurrentAnimationTime = (int) ((now - mMovieStart) % dur); 
  } 
  private void drawMovieFrame(Canvas canvas) { 
	  // 设置要显示的帧，绘制即可 
	  mMovie.setTime(mCurrentAnimationTime); 
	  canvas.save(Canvas.MATRIX_SAVE_FLAG); 
	  canvas.scale(mScale, mScale); 
	  mMovie.draw(canvas, mLeft / mScale, mTop / mScale); 
	  canvas.restore(); 
  } 
  @SuppressLint("NewApi") 
  @Override 
  public void onScreenStateChanged(int screenState) { 
	  super.onScreenStateChanged(screenState); 
	  mVisible = screenState == SCREEN_STATE_ON; 
	  invalidateView(); 
  } 
  @SuppressLint("NewApi") 
  @Override 
  protected void onVisibilityChanged(View changedView, int visibility) { 
	  super.onVisibilityChanged(changedView, visibility); 
	  mVisible = visibility == View.VISIBLE; 
	  invalidateView(); 
  } 
  @Override 
  protected void onWindowVisibilityChanged(int visibility) { 
	  super.onWindowVisibilityChanged(visibility); 
	  mVisible = visibility == View.VISIBLE; 
	  invalidateView(); 
  } 
}
